Lens casing



FIG. 1 is a perspective view of the bottom, right, and front views of a first embodiment of our design;

FIG. 2 is a perspective view of the top, left, and rear views of the first embodiment of our design;

FIG. 3 is a perspective view of the bottom, right, and front views of a second embodiment of our design; and,

FIG. 4 is a perspective view of the top, left, and rear views of the second embodiment of our design.

The only difference between the first embodiment of our design shown in FIGS. 1-2 and the second embodiment of our design shown in FIGS. 3-4 is the addition of a lens in the second embodiment. Such a lens is shown in dotted lines in the first embodiment and, thus, forms no part of the claimed design of the first embodiment. Moreover, the dotted lines shown in the figures represent environmental structure and form no part of the claimed design. 

The ornamental design for a lens casing, as shown and described. 